Sodium oxide or hydroxide.

Popularly, sodium carbonate or bicarbonate. Sodium bicarbonate is also called baking soda

same as sodium, used in terms such as bicarbonate of soda.

a non-alcoholic beverage, sweetened by various means, containing flavoring and supersaturated with carbon dioxide, so as to be effervescent when the container is opened; -- in different localities it is variously called also soda pop, pop, mineral water, and minerals. It has many variants. The sweetening agent may be natural, such as cane sugar or corn syrup, or artificial, such as saccharin or aspartame. The flavoring varies widely, popular variants being fruit or cola flavoring.